Experimental study and modeling of oxy-char combustion in a pressurized fluidized bed combustor

Pressurized oxy-coal combustion has received wide attention recently due to its potential of high efficiency and low cost in CO 2 capture. However, there is still a significant knowledge gap on the effects pressure oxy-char behaviors. In this study, experiments were carried out pressurized fluidized bed combustor, oxygen concentration burnout time, reactivity temperature char particles investigated. The experimental results showed that time decreased significantly with an increase from 0.1 MPa 0.5 MPa. Besides, either (within range – MPa) or 10 30% O ) led increases particles, while promotional weaker at higher pressures. order better interpret results, model considering reaction kinetics, mass heat transfer, energy balance was developed validated by results. simulation would reduce only when kinetically controlled combined kinetic-diffusion controlled. Once became diffusion-controlled, further have insignificant effect time. Although values kinetic constants different models, global power-law Langmuir-Hinshelwood model, adopted, particle under conditions almost same since mainly diffusion-controlled. elevated accelerated both rate char-CO gasification rate, carbon consumption ratio increased pressure. Moreover, enhanced had great impact especially conditions.